backfire 6.0 bad

This is a discussion on backfire 6.0 bad within the Internal Engine forums, part of the LSx Technical Help Section category; i need some help i have a 6.0 in a 98 s10 and at idle it will back fire out ...

backfire 6.0 bad

i need some help i have a 6.0 in a 98 s10 and at idle it will back fire out the exhaust and if you give it gas it gets worse i have a wiring harness that was custom made and the computer was tuned by pcmfor less he took out the egr air pump and the evap and the rear o2 sensor i have had some people say it was timing and other say it is fuel any help would be great thanks